Well, I'll weigh into this, albeit a bit late.
Just managed to pick up a pair of the Sony WH-1000XM2's yesterday. I did consider the QC35 II's and the B&W PX's. My friend recently got the QC35 II's, and so I had a wee trial of them recently. They were good, I will admit, but I am not a great fan of the Bose sound. These Sony's on the other hand, are excellent. I have given them a few hours use tonight, with various sources, from HD music, to mp3 to Netflix movies, and they have sounded great in every instance. I don't usually like Sony products, but I have been warming to them more recently.
I did want the PX's. They look great, and I am a B&W fan. However, with that said, every review I have ever read / watched, put both the Sony and the Bose ahead of them. I am too far away from anywhere that I could demo them also, so I ruled them out pretty quickly.
The WH-1000XM2's, however, were only £260 on the rainforrest for a few hours last weekend, and I just managed to grab a set before they went back up in price. Took a few days to arrive, but to save £70, it was well worth it. I certainly can't complain.